The non-ABS snorkel has a shorter external bit on the wing and comes in to connect intot he airbox where the ABS control unit sits on the inner wing.
To get around this the ABS capable snorkel is longer and reaches nearer to the front of the wing before coming into a newly created hole in the side of the airbox.
Probably nothing stopping you fitting an ABS type snorkel but there are more Non-ABS ones out there secondhand...
Hope this helps...