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The R7 M440 and R7 M340 is the same card with a different name. There is no problem.
AMD and NVIDIA both rebadge logic with the annual cycle of new hardware. New models of GPU tend to surface in mid to late summer leading into the holiday season.
My trusty old HD 7870 has been rebadged a few times. The card is extreme enough to be viable for a long time to come.