The picasso II is a old slow,2mb ram card that is zorro2. Its lucky to manage 800x600 and if you try 24bit(i dont think it will do past 16bit with only 2MB),it will crawl.I think the PicassoII+ had 4MB ram.
No, they are almost identical (2MB); plus is slightly faster. 24bit is almost unusable slow (800x600 max), I kept 16bit screen if possible.