Yes, I'm sure. Swinging a racquet isn't about muscle mass in your arms. It's about timing and your core strength. Look at Nadal. He has huge arm muscles yet he uses a lighter racquet than Federer.
Federer couldn't hit the shots that he hits with an AK90 as it's too light and under-powered. You need the mass of the US K90 to generate the momentum that he does on his shots, especially his forehand, and to block back 140 mph serves with control, and also to put that much punch behind his volleys. Besides, he used a stock PS 6.0 85 for a long time which is much heavier and swings much heavier than the AK90.
No, I don't know where you can get the AK90 or ABLX90 except in Asia. And, no, they are not the closest racquets to the PS 6.0 85. The US K90, US BLX90, and KPS88 would all be closer to the PS 6.0 85. The PS 6.0 85 is a heavy racquet by today's standards, and I think it swings as heavy or heavier than the K90/BLX90 does.
Dude,
Wilson ProStaff 6.0 85
Technical & Statistical Data
Length 27 inches 69 centimeters
Head Size 85 square inches 548 square centimeters
Weight 12.6 ounces 357 grams
Balance Point 12.50 inches
31.5 centimeters 8pts Head Light
Shaft Width 17mm Straight Beam
Composition Braided Graphite & Kevlar
Babolat RDC Ratings
Score Grade
Flex Rating 66 Range: 0-100
Swing Weight 329 Range: 200-400
Maneuverability 67 A
Wilson K Factor Six One Tour 90 scores
Technical & Statistical Data
Length 27 inches 69 centimeters
Head Size 90 square inches 581 square centimeters
Weight 12.5 ounces 354 grams
Balance Point 12.375 inches
31 centimeters 9pts Head Light
Construction 18 mm Straight Beam
Composition nCoded High Modulus Graphite / Carbon Black
String Pattern 16 Mains / 19 Crosses
Babolat RDC Ratings
Score Grade
Flex Rating 67 Range: 0-100
Swing Weight 336 Range: 200-400
The swingweight is 7 points less for the 85.
Good times.