The Amiga 2500 is really just an A2000 which was supplied with either a Commodore A2620 or a Commodore A2630 processor card, and a hard drive controller which was the Commodore A2090 or A2091. A variant of the A2500 called the A2500UX was also available which was supplied with Commodore Amiga UNIX by default, although Commodore certainly shipped some A2500s without the UX designation with UNIX as there is no hardware differences between to two "models".
Please see the A2000.