Cartertank it’s more common for the pins to act purely as the pivots for the carriages to swing on, one resting on the other, the main vertical load being on the small mating surfaces of the two carriage faces, which often have a bronze or brass bearing spacer (like a washer) fitted between the two.
On some very heavy doors provided with adjustment the ends of the pins are made to take more load, but they are usually hardened and sit on large ball bearings at the point of contact inside the carriages. They are always precisely faced off and centred to fit the bearing.
If the door looks to have dropped slightly and appears low when closed in the body (it’ll drag on the bottom if bad enough) then it might be that it originally had spacers between the carriages.
Making new ones at the same time as the new pins would then reinstate it back to how it was, but only if it’s needed for the door to be correct height-wise.
I might be barking up the wrong tree whether your safe originally had the spacers or not, as I simply don’t know, but a few image searches should reveal if they were fitted or not.
