Is there any way I can use the .csv imports feature and get the cards to import as the showcase or textless versions?. I noticed Card# when hovering over the card so I tried adding this field to the .csv file header row but it just says unrecognized. I tried other things too such as Collector Number but nothing seems to work. If anyone could give me a heads up on this I would appreciate it.

The column name is "Card Number". You can export your inventory and check out the resulting csv to see all the possibilities.