I bought a scale! And I measure my yarn, and I'm pretty sure I'm going to make it! The finished sock weighs exactly 50 grams, so I should have exactly enough yarn to finish the pair. And I do have some other blue yarn that is not exactly the same, but if I need it to finish the toe, I won't cry.
I just wanted to let you all know! Thank you for the advice :-) Happy weekend knitting!