78" compared to a 74"?

So I woke up this morning to a text from the seller with Indie's bit size and blanket size... 74". A week ago, she had told me it was a 78" but she must've double checked and found out otherwise.

My problem? I just paid $300 for two blankets, both 78"s. My question is, how much bigger would a 78" be compared to a 74"?

Did you buy online? Or at a local store? Since you don't have the horse yet, they haven't been used, right? So, return, exchange, do what's necessary. It's fixable & a 4" difference in sizes is pretty major. You may want to measure the horse yourself,though! If, so, return the blankets, get a a refund, then buy when you are sure of what size you need.

I bought it online, so returning it isn't that simple.. I still haven't even gotten the shipping quote for it yet either so maybe it's not too late to cancel the order. I'm going to look into it.

ETA: Apparently my order history is not available at this time.. so I sent an e-mail asking if they could swap the blankets in my box for 74"s. If I don't get a reply by tomorrow, I'll probably get my mom to call them. I heard good reviews about them (SSTack) so I expect to get my order before too long and at least hear back within a couple days, although I know it's the weekend.