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You need to set the baud rate of your serial line to match the baud rate of the module. The BT communication rate is determined by the Bluetooth version and PHY.
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Your esp has way more ram and is much faster and it’s not the same BT version (up to 5 versus 2)
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do yourself a favour and please read How to get the best out of this forum and provide the code and necessary documentation. (Ie issue might be in your code for example)
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Don’t think so. DIfferences between the 2 setup are big
why don’t you just use the ESP if that works?