Transformers? Do you mean the engines or the actual blocks? If you mean the engines, then no. You can upgrade them, but to another tier of it. Like, you to make a higher tier of an engine, you need the lower tier of it. HV needs MV, MV need LV, and LV is a different recipe. All of the block recipes will end up like this.
why? It would make some sense to do that with power generators, but not converters.