Paul. with a turbo engine. As the air pressure from the turbo builds the engine needs more fuel to utilize it. So a device on the injection pump, the alda is altered by the pressure in the line. Called boost pressure I believe. This enriches the fuel amount per injection. As the pressure changes the additional fuel amount is increased or reduced. With your normal pump now present with no alda or boost connection it will not enrich when the boost pressure increases. There is an altitude compensator on the non turbo injection pump instead.

One thing is for certain once you get through this adventure the fuel supply system will be much easier for you to deal with the next time. You in fact did carry the normal pumps lift pump over. I assumed that was done anyways originally. That was what the vast majority would have done..

The chances of both lift pumps being problamatic are small. Swap the return and supply lines first and pump until you have fuel up and try the engine.