ac evaporator

If this were me, I'd hook it up and try it.

You might want to figure out how to monitor the system 'for a bit' going down the road, that is, suction temperature and operating pressures.

Either that or you need a mechanic / shop you can bribe that has "big fans" to run it in place

You know what is meant by (suction) superheat and how to measure it?

"Generally" here's what you are looking at.

Heavy heat load, that is, hot, cab hasn't cooled, or system capacity is a little low, will lean towards higher suction pressure and higher superheat

Light heat load, or cab has cooled, or larger system which can easily overcome, leans towards lower suction pressure and lower superheat.

More refrigerant, drops the superheat

Heavy heat load, "smallish" condenser runs high side pressures up, leans towards higher superheat

Lighter heat load or oversize condenser runs high side pressures down. Leans towards lower superheat

Compressor leaning towards low capacity as to the rest of system leans towards lower high side, higher low side.

Mismatched metering device, IE expansion valve, WITHIN LIMITS can regulate itself, but there is of course a limit. "Too big" means flooding the evap, higher suction pressure and lower superheat

Too small means lower suction pressure and higher superheat.

You have to use your head. No pun intended LOL. Keep in mind "what the cab" is doing for heat load and "what the condenser" is receiving for airflow. If you are in a shop with a too-small fan, you will never be able to simulate conditions you want

What does this all mean? For one thing, it means you do NOT want to come up with an overcharged system which will flood the compressor suction with liquid under "adverse" conditions such as

low cab temp on a cool day, also made worse going down the highway on that cool day producing low high side pressure.

THE NUMBAH WHAON worst thing you can do is produce a situation that will allow liquid back into the compressor