Getting my entire music library to have the same sound quality..

…is this impossible? i have some ripped from CDs some downloaded from Amazon and Internet Archive (which as far as bitrate is concerned is a gamble, you don’t what you’re getting) Is it possible to have my entire music library to sound as if they came from the same scource. I’m somewhat of an audiofile but maybe just to a certain point. I found an MP3 converter that will convert audio files to MP3 in between 240-253 bitrate. I found out Googling that all converting does is degrade sound quality even if it’s as high as 320 or low as 128.. so..🤷‍♂️ i’m at a loss. I just don’t want to be in a situation where i’m sitting with an audiofile and she/he can tell what scource of the file is just by listening….

Is it just absolutely impossible to normalize my entire music library. or if not, is it gonna be extremely difficult and time (and maybe even battery) consuming??