There are potentially 2 separate issues regarding the NIP - the warning given that the driver might be prosecuted, and the requirement to name the driver under s. 172 RTA 1988.
The requirement to give a warning is that (for the purposes of this thread at least) a NIP must be served on either the driver or the RK within 14 days of the date of the alleged offence. That was either complied with when the first NIP was sent to the RK, or it wasn't. There is no subsequent requirements for further NIPs (for the purposes of warning that the driver might be prosecuted), and strangely enough, no defence from any failure to serve a subsequent NIP that is not required anyway. So, unless this gets close to timing out (6 months from the date of the offence to instigate court proceedings), they can send out what they like when they like.
The actually relevant issue, is the purported requirement to name the driver under s. 172 RTA 1988. The legal requirement to do so is triggered by service of a notice addressed to the addressee. If there was some relatively minor discrepancy with your name, and it was delivered, the consensus is that it would have been lawfully served. When it is a completely different name, I would suggest that that is not the case.
Whether this will blow up in yours or your employers' face is anyone's guess - unless you were to take mind altering drugs and come up with an idea beyond rational comprehension, like asking your employer what information they provided.
As regards what you should do next - contact them or ignore - what you should do is refrain from asking stupid questions.
We can, and have told you what the options and possibilities are. It's up to you to decide which path to take.