2 of 3 clarification

“Assuming we are to…” vs “Assuming we were to”

I've been doing some exercises lately when one thing struck me:

Miss Baiocci would, I am sure, be a real asset to your organisation, knowing as she does a great deal about the way a company such as yours operates. [...] If it were not clear that she is determined to move away from this area, we would try everything we could to keep her here. Assuming we are to lose her, I would be happy to know that she was being taken on by a company with a reputation such as you enjoy.

The "are". It is in accordance with the answer. The thing is, I thought it should have been:

Assuming we were to lose her, I would be happy to know that she was being taken on by a company with a reputation such as you enjoy.

I thought it was obvious at first glance that this is the Type II Conditional.

Which version is correct?

Thank you!

Grammar and Vocabulary for Cambridge Advanced and Proficiency by Richard Side and Guy Wellman