Need an education - 1967 GMC stepside

[don t. - 72gmc]

Fleetside fan that just maybe is turning to a step side.
Being a bit fussy, GMC - 1967 only, if I could.

I assume a fleetside/stepside cabs are one in the same, correct?
The bed would be the only "real" difference?
Spare tire, rear lights, tail gate, bed swapable w/a Chevy?
Any 1/2 ton vs. 3/4 ton vs. 1 ton differences?
Do longhorn beds exist for '67?

Anything I should ask, but don't know to ask?

Thanks much, appreciate the info,
....don t. .....