Measure the specs of both rackets. Static weight (get a pocket scale that reads to .1g), balance point (many ways to do this), and swingweight (
http://twu.tennis-warehouse.com/learning_center/swingweight_calc.php).
Put the specs of the rackets in here.
The problem is this tool isn't perfect. It doesn't take twistweight into account. The twistweight of the two rackets are similar, so if you add too much weight to the sides, it'll be noticeable.
This is how I'd go about it for myself:
1) Measure the specs of the Clash Tour and Clash 100.
2) Using
http://twu.tennis-warehouse.com/learning_center/customizationReverse.php, find out (through trial and error) how much weight you need to add to the top of the racket to match the swingweight. If you're planning to put the lead under the bumper guard, you can use 26.75 or 26.5 as the distance to approximate. If you're putting it inside the hoop (string-side), then 26.5 or 26.25 is a good approximation. 3 grams is approximately 10 points of swingweight. I recommend not using lengths longer than 10 inches. I probably wouldn't go over a foot. You probably won't need that much, you'll probably only need two 6-inch strips of 1/4-inch lead tape.
3) Apply the weight and measure the new specs. Now all that's left to do is match the mass and balance as best as you can. Now you know how much mass you need to add to get the mass to match, so put that into the worksheet and mess with the length until you hit something very close to what your Clash Tour is at (getting it exact likely won't be possible, but the numbers will be so close that you won't notice a difference).
4) When applying handle weight, it's likely you won't be able to center it all on the correct spot without putting on too many layers (which will noticeably bulk up the grip, so feel free to spread it out or try using a glue gun with lead weights or silicone injection inside the handle instead (or combine both strategies to make it easier).
The benefit of this method is you can accurately match swingweight and mass without messing too much with the twistweight, which is good if that spec was already similar for both rackets like it is for your rackets. You can try to measure the twistweight to be more exact, but it's a pain in the ass to do. The downside is that balance (or mass) will have to suffer slightly for it. For me, that's fine, since I mostly only care about swingweight > mass > twistweight > balance. I probably care about twistweight more than I realize, but I'm not willing to go out of my way to measure and calculate it, especially since the quality control on my rackets is terrible enough without having to worry about it.
If you care less about twistweight and would rather match swingweight, mass, and balance, the tool I linked above is better, but the twistweights can vary pretty wildly. It's also a lot less pretty to look at when you have random patches of lead tape on one racket and nothing on the other, so I recommend aluminum foil tape. It's 1.2 grams for 1 meter * quarter inch area, which is .03 grams per inch*1/4-inch. The only problem is you'll have to cut the width yourself it seems. I didn't do an in-depth search so maybe there are some 1/4-inch aluminum foil tapes out there.
If you need more room to modify the weight on the handle, remove the stock grips of both rackets and replace it with Wilson FeatherThin, then add back weight onto the handle to get back to the original specs on the Clash Tour. Start placing the lead tape in the middle of where the grip would be and add additional layers outward from there. (Unless you are accurate in injecting silicone or glue gunning lead weights into the handle, which are better methods but harder to do and undo). The caveat is that the grip size might end up a bit smaller than before.