Assume transformers are
500kVA transformers. Primary is high voltage side and secondary is the low voltage side.
Normally we do
Z_secondary(LV) = Z_primary(HV) * (Vrated2(LV)/Vrated1(HV))^2 to refer impedances from primary to secondary in case of a single transformer. My question is, if instead, two identical transformers were connected in parallel, will the referring be the same? Or will there be any changes in the above formula?