Easiest way - stick it in the slot. If it fits, it's right. [1]
Zorro cards are quite distinctive because they have one long cardedge with 100pins on. ISA has 2 sections (unless they're 8-bit in which case they're much smaller), PCI has much more dense, smaller connector, VLB is ISA with even more stuff tagged on the end. AGP is PCI sized but has two sets of pins on the connector edge.
[1] This applies to many facets of life, not just Amiga boards.