Welcome the forum. You may want to clarify your post.....
Dillon makes a
case collator they sell separately from their presses, but no bullet feeder.
RCBS makes pistol and rifle
bullet feeders/collators, but no case feeder.
I can use a Dillon case collator (or any other for that matter...even Lee's shaker) on the $65
homemade case feeder I created for my Pro 2000.
As for bullet feeders on the Pro 2000, you can use RCBS's, Hornady's, or Mr. Bullet Feeder's.
People have used the RCBS bullet feeder/collators on Dillons. For 650's it takes a conversion kit RCBS sells. You can also use Mr. Bullet Feeder's, and GSI's bullet feeders on Dillons...at least on 650's and 1050's.