Yes, one has a 3.5 mm TRS the other a 2.5

So one will fit in the earcup and the other won't.

As you do have the Sundaras, measure the current jack that go into the earcup. My guess is 3.5 https://hifiman.com/products/detail/286 but make sure before you order.

Have it terminated with a mini XLR and order a mini XLR to 4.4 pentagon as well.

The fun of the mini XLR is that Hart offers all kind of adapter making it possible to connect to anything https://hartaudiocables.com/collections/hacable-kit