In regards to wearing the murex techeiles, there is no chashash of baal tosef if it happens to be the wrong one (even though it’s poshut the right one).
Look at the Gemara Menochos (40a) which says, in regards to wearing Kala Ilan instead of real techeiles, “lo yehay ela Levan”. Meaning there is no difference between wearing the colored strings if it happens to be the wrong techeiles.
From here the rishonim are medayik that there is no baal tosef in regards to wearing the ‘wrong’ techeiles. See tosfos (ibid 38a hatecheiles) and the rosh (hilchos tzitzis siman 6).
Also, the minhag or halacha of wearing the strings the same color as the beged doesn’t apply to wearing the ‘wrong’ techeiles, rather only the strings that are bmekom the lavan strings. Ayin Chazon ish (OH 3:25).
Its pretty clear that there is absolutely no downside to wearing the murex techeiles if it happens to be the wrong one. It’s also pretty muchach that it is the real techeiles. And even if it is a safek, we apply the ruling of safek doreisa lechumra.
Slowly but surely, more poskim and rabonim are starting to wear the murex techeiles. Beezras Hashem, klal yisroel should be zoche to keep the whole Torah k’halacha.
If anyone who is open minded and has any questions on the topic there are plenty of seforim and websites that discuss this topic in great length with real substantial arguments and reasons.