Trying to understand the difference between between these two HGVS

Question

[curious]

I have two HGVS:

NM_000106.5:c.1457G>C

NM_000106.6.7:c.1457G>C

I am guessing that NM_000106.6 is the later version of NM_000106.5

I don't get what the 7 means in NM_000106.6.7 though