That looks like the standard blue connector that fits to the most common version of the heated rear window switch with the blue connector fitted to these cars.
Not surprised that there are differences between the Miata and Eunos with this setup - the Miata seems to have a lot of variation when compared to Eunos or UK spec MK1.
We are well used to the Eunos in the UK but Miatas are very rare over here.
This switch is not cheap I’m afraid but occasionally come up for a fair price secondhand on ebay.co.uk.
Yeah The site i linked to would be about 70$ Canadian after shipping and duties. Ill look around here to see if anyone has one. If i can get one from the UK under 50$ Cad shipped im all for that lol