Compatibility of the changer extension cord MBP 2015-2020

I have just upgraded from a MacBook pro mid 2015 to the 2020 version.

my question is in regards to the compatibility of the changer extension cord that is included with the 2015 edition. is the extension piece compatible with the 2020 MacBook pro charger and MacBook itself. will it affect the battery or mac in a negative way if I use the extension piece from the mag safe charger on the new 2020 USB-C charger? if it is unclear I am referring to the extension cable. I do not like using the included wall piece that is included with the 2020 edition as the charger block has some weight to it and the block seems to slowly fall out of the wall socket when attached. uneven weight distribution.

thank you,

[Edited by Moderator]