ECCV reviewer wants me to compare and contrast to my own paper. [D]

Bascially title.

A reviewer found the arxiv of our paper, which is an older version, before we changed the title and name of the method for this submission. The results, figures and all that are the same minus some additions for the current version, a even small reading of what they are referncing should make it clear its the same paper by the same people.

They use the very specific language of our previous writing without citing it so we cant be 100% sure they are but we are fairly certain.

We are planning to write a little note to the AC and say we cant address it in our rebuttal for double-blind so we did not refute that issue raised.

What would you do in this situation?