Transformers can be banked in parallel to multiply capacity but you need to make sure that
1) impedance ratio is identical
2) their voltage ratings are the same (including tap settings)
3) polarity is correct
4) proper switchgear is used on both side of the transformer.
Even a small mismatch will create HUGE current loops.
In short yes, but get it done by specialists.
Added after 4 minutes:
I forgot to mention
5) make sure that your busses can handle the increased current flow
6) make sure your earthing can handle the increased prospective ground fault currents.
Which still says - get it done by specialists.