Climb360,
Says it all really.
Given you have flown the NG I don't see any disadvantage that you will now fly the Classic, some companies fly both simultaneously & it seems to pose no problems.
With its slightly less advanced features it is perhaps slightly harder to operate, so should be seen as a feather in your cap, not the opposite. (if the person assessing the situation truly appreciates the difference & is not just an HR pen pusher. )
Same rating same type, any company making a meal out of it is probably not worth joining.