You are not defining the Quality of the replacement speaker ,is it a 2 way to a 3 way speaker if so the quality ,and size difference . Your room can excite different bass frequencies ,and what’s called suck out in certain rooms . If if ported maybe ports are different. Having room treatments helps for sure, rugs in front of speakers .you did not give ample information to have any idea of the brand any differences .
just changing tweeters , and cabinet driver types ,and theSynergy between the amp and speakers ,power doesnot guarantee synergy . .having. Been in audio sales
over 20 years in the past there are a lot of factors .if you mention your part, and present speaker, amp current amplifier your using , efficiency , and what’s not the same or likes, dislikes between the 2 then you can create a picture ,and room , is there anything different there ? Glass can make a big difference reflections especially if a different speaker ,like going from a monitor to a floor stander .