Can we move character slot expansion tickets?

Hi, after the recent server merges on EUW, I have had all my characters put into my universal storage and I have to use the character slot expansion tickets again. I was wondering if we would be able to transfer them to another server, such as on EUC, or whether it is tied to the server/roster? I was hoping to use them on EUC and I wanted to avoid purchasing more as I haven’t made the characters on EUW

Wouldn’t it be faster to just try and use it on EUC server instead of waiting for reply?