[mothered]

Decided to go with the wrong item received method. The electric toothbrush I would swap is 1 lb. Since this is my first "WIR" method, would a weight of 1.3 lbs difference have an effect of the refund on Amazon going through? Can the lower end electric toothbrush and higher end electric toothbrush be purchase on the same Amazon account and same day? Thanks in advance.

Are you saying that the "overall difference" In weight Is 1.3lbs?

In terms of the account, you can certainly purchase the toothbrushes on the same consignment/order.

Yes, that is what I meant to say. The overall difference is 1.3 lbs and I was wondering once I do the item swap if that difference would have such a negative effect on pushing the refund to go. In other words, does Amazon care about that or would it be ignored?

1.3lbs Is almost 600 grams, which Is significant enough to possibly raise suspicion.

It may not happen, but It's certainly a possibility.