Can just exchange the inside to upgrade a ballast

[BCReefer]

I currently have a 175 W ballast which came in a black metal case. If I am able to find a 250 W or 400 W ballast that fits the same case, can I just exchange the innards (and of course the bulb)? If I am able to p/u a ballast from HD or Revy etc for $50.00 I will definitely look into it.

I am worried about the extra heat from a higher wattage ballast.

Or do I need to replace the socket, wires etc?

Thanks All
Patrick