I lost my BRP CARD recently and mistakenly followed links to apply for a full BRP instead of a 'replacement' will this cause issues or will the application proceed as normal?

I'm so confused!

I changed my name and applied for a new passport and BRP. Since then, I lost my BRP on the train. I've sent an application for a new BRP, but it won't be back for some time. However I need to travel to Ireland for work urgently. I still have my old passport with a vignette that has an expiry date of ...