[seyeji6422@asoflex.com]

A believable weight difference might be something like 150g.

Too much of a variance.

To play It safe, opt for half that weight at the maximum.

I've done some research and two packages differ by about 100 grams, but I've noticed that that GLS (courier used by the company) is not that accurate and I think they will be both measured as 0,5kg (460g and 540g) in the tracking. Does GLS parcels measurements accuracy depend on the state?
Another question: Can the company see that the owner (name) of the two different cards on the different accounts is the same or does the site mediate and hide it? Is there a difference between amzn and ebay?