I am guessing you are wanting to use the A2091 with a H drive. The Combo card would be a smidgen faster than the A2091. Yeah?
I took my A2091 out of my A2000 with combo 040 when I got 2Mb of Chip ram (Mega Chip). I was only using its 2Mb of Ram. It's a slow scsi card.
Gertsy