If you have an amount in Box 14 for MFSA is that the same thing as HSA or MSA?

The code stands for My Flexible Spending Account.  Box 14 is informational and can be used for almost anything.  The amounts are not used to compute your tax return.  If you cannot find the correct category to match what is on your W-2 then select Other (not classified).
 

Here is an Article about Box 14 codes.