mk4 brake upgrade onto the mk3

[pandrade]

I have recently rebuilt all of my mk3's calipers and they work great whith the new rotors and pads. When ever i do break test the ABS works great. Now i know when your close to locking up your wheels its the most break pressure your gona get, now my question is my mk3 has ABS and performes great but im going to use much more sticky and wider tires for autocross events. The facotry set up works great on the but in a race setting i belive they will fade and quickly, i have a local tuneing shop that will put on mk4 claipers onto my car for dirt cheap, my question is will there be a problem whith the ABS whith the mk4's callipers on my mk3 and if so what would i have to do to make them work since i dont want to drop 1k into my breaks for a brake kit