Foreign exchange rates and valuation

Hello Mike
If a company has foreign currency lets say USD bank accounts with different banks, is it ok for them to value it in local currency lets say LCD using the fx rates given by the various bank or should there be one consistent rate used across all bank accounts when converting to the local currency?
Also, would the answer be different if :
1.the functional currency is USD while the local currency is LCD
2.the functional and local currency are the same.

I’m asking because I came across a situation where there were 4 bank accounts and they each were valued using 4 different exchange rates (which were the fx rates for the respective banks)