Well, there will be... essentially if the flow is restricted then the AC will 'work' but with a much slower transfer of heat. if the Thermostatic valve is failing, then the flow will be OK but very little will go through the evaporator (so the temperature measured at the 'in' and 'out' pipes will be very close, if not the same) with a RCV valve issue, there will be a change in temperature across the evaporator, albeit only a degree or two and the 'low' side pressure will be higher than expected due to lack of suction from the compressor.

Correct diagnosis requires an understanding of the system, understanding of the high & low side readings - especially with regard to temperature and the ability to take temperature readings that are accurate and from the correct location in the system.