https://www.schneideroptics.com/ecommerce/CatalogItemDetail.aspx?CID=1554&IID=8152
Yes .. 3.4mm vs 5mm
https://www.schneideroptics.com/info/faq/bw.htm#qu26
XS-Pro Digital: This mount is especially suited for DSLRs with wide angle and zoom lenses. It has a front thread for additional accessories such as lens caps or hoods. All XS-Pro Digital mounts are made of brass and are matte black to prevent reflections. Only UV, Clear, and Käsemann Circular Polarizers are offered in this mount, with the latest MRC nano coating.
Multi-Resistant Coating (MRC) with Nano Technology
The nano coating is an outer layer of protection that comes standard with all XS-Pro Digital MRC filters. The nanotechnology based characteristic (lotus effect) produces a better beading effect with water making the cleaning of this filter even simpler and faster than ever before. MRC nano has an improved outer (8th) layer over regular MRC.
If u do a search on their filters for XS-Pro Digital you find that only got 49-86mm filters ..
https://www.schneideroptics.com/filters/filter_search_bw.aspx