Maybe. Nonetheless, I came to understand from Koss that the replacement of the 35's with 75's occurred when Koss had no 35's for replacement. And that was the reasoning for the swap. However, when I spoke to Koss in a later conversation, I was advised that they always had secure levels of stock of the 35's but that they were not sold for a time period for reasons not disclosed.
I was one such person that had a pair of 75's sent to me to replace 35's years ago. (I also prefer the 35's to the 75's for their sound and scaleability with amplification) When Koss again started shipping 35's, they were kind of enough to ship me a pair of 35's for my 75's when I shipped them back at my behest.
I hope it works out for Koss in the long run.
I should have posted a smiley along with my post, as it was also in humor as a post.. : )