galvanized hot dipped vs electroplate
I doubt the person that wrote the instructions knew the differences between hot dipped and electrogalvanized and so was not expecting a significant difference. Zinc coatings provide limited protection for mild corrosion. For a small job any stainless would be a big improvement for little cost. However; hot dipped tends to be thicker but not as ductile because of brittle iron/zinc intermetallics. I worked in corrosion protection and do not recall either process being required for an application other than bolting where electro-galvanized was was preferred to keep threads profiles free of buildup .