Chef cooktop wiring

Question

I have to temporarily replace an old ccok top with an oldish electric chef with solid hotplates. There are 4 wires connected to the Chef, 1 green [presune earth] and 2 white and 2 black wires, and only 3 from the mains end ie black green and red. Is it ok to join the 2 whites to the mains live and the 2 blacks to the mains black and the green to the mains green - all joining with haevy duty cable conectors
I'm 'in the country' and 'sparkies' are hard to come by and this will be a temporary solution until our kitchen is renovated.

Dean