Would the full size game fit on a standard switch cartridge? A quick google shows it takes up 27 GB after install on the ps4. Has that changed for the switch?
File sizes look identical on Switch. The two games would fit on a 32 GB game card which is currently the most expensive option, but that wouldn't be a problem because of Capcom rising the price by $20. The costs for a higher capacity game card would be more than covered. But instead Capcom cheaps out again and adds a ridiculous proft margin for themselves.
An alternative would be data compression to use a smaller game card. The example of Crash Bandicoot N.Sane Trilogy has a compression ratio of roughly 4:1, so on Switch it's sold on an 8 GB game card, which according to ZhugeEX, costs a third party the same as a Blu-ray copy on PS4 and XB1.
While 16 GB and 32 GB game cards have higher reproduction costs than the smaller sizes, it's nowhere near what third parties want people to believe. The retail price could be raised by $5 to cover the additional costs, but a minimum of $10 has been the case. This even includes games that were shipped on 8 GB game cards. Of course not all third parties have employed such practices, but some of them seem to be convinced that they can trick people into believing that cards and cartridges are exactly the same thing, therefore a copy pressed on a card has to be more expensive than pressing a Blu-ray.
The bottom line in this specific case is that Capcom had various options to make RE Zero and Remake a true physical collection and at the same time at a lower price. They couldn't be bothered once again. (Thread title already gives it away that shady practices are common for Capcom.)