Triumph coolant not available

[CrzystghndKC]

Hello,
Rocket 3r needs following coolant as per manual
A9610046 HD4X OAT COOLANT

Triumph dealer(s) is saying that they dont have A9610046 HD4X OAT COOLANT.
Triumph Dealer saying use this instead but remove old coolant first and dont mix these two.

Can i mix them?
Why dealer said that dont mix these two?
What if I mix two of them?

I need to top up the coolant as its running low in small white plastic tank behind radiator.

Thankyou

I think if you can get the Honda coolant it will be compatible.