Need ballscrew support Bearings.

For a BP series 1 CNC machine.
I need new ballscrew support bearings for both the X and Y axis. Big
question is if a matched set of the special "ballscrew support"
bearings are worth the extra money? (probably $400 per pair)

Will I really be able to notice a difference in performance if I just
use 2 "unmatched" angular contact bearings? Will they wear prematurely?

This is just a hobbiest machine and will not see heavy usage.
The bearings I need are:
X- 80mm od, 50mm id, 16mm wide
Y- 52mm od, 25mm id, 15mm wide

Thanks for any help.
Scott