BMminer Version and CGminer Version 4.9.0

[migqc]

Hi there,

A quick question , I just recently bought two L3+ Antminers.
When I check the System information (Antminer 1)  through the Antminer page configuration I can see that there is BMminer Version which is empty .
On the other hand, If I do the same on my (Antminer 2) I can see that CGminer Version 4.90 is present.

1- Why there is one empty (BMminer Version)  and the other version is populated to be CGminer Version 4.90 on my other miner?

2- What difference it will make by having BMminer Version on one Miner and the other having CGminer Version 4.90?

Hope you can answer this questions

Cheers