The first 24,576 bytes are byte-for-byte identical. The extra 8 KB in the .BIN is all 0xFF erased-EPROM padding, with a single correction byte (0x75) at the last address so the full 32 KB also sums to zero — i.e. it's a read of the entire 32 KB chip, not a different image.

ROM identifies as: AMI VGA BIOS dated 09/01/89, "Stealth VRAM Vers. 2.33, (c) Diamond Computer Systems". Strings for both 0.5 MB and 1 MB memory configs are present. No PCIR structure, as expected for an ISA/VLB-era card.

Which to use:

Flashing / emulator ROM slot → STEALTH.VBI. It's the exact image, and anything that validates length against the size byte will be happy.
Burning a 27C256 EPROM → STEALTH.BIN. It's already sized to the chip; the VBI would need padding first.