I need help since I know nothing regarding Chinese coins. So, I’m sorry if at any point I sound stupid, that is because I really am on this subject (Chinese coinage).
So, I got a big lot of coins and I found some Chinese coins in it. I tried hard to identify them, and I found similar coins, just the weight is all wrong for the first 3 coins. My scale is not precise, but the difference is just too much. So, I’m wondering if I identify the wrong ones, or maybe if the coins that I got are counterfeit coins (I think that is the case). But before I throw them in the bin, I decided to ask for help, maybe someone here has a higher expertise on the subject. Also, any help on identifying the last coin will be appreciated.
Here are the pictures, and below I added some information for each coin.


COIN #1
Similar coin on Numista catalogue: https://en.numista.com/catalogue/pieces36541.html
Weight: 4.7 grams
Diameter: 24 mm
COIN #2
Similar coin on Numista catalogue: https://en.numista.com/catalogue/pieces17772.html
Weight: 4.4 grams
Diameter: 23.5 mm
COIN #3
Similar coin on Numista catalogue: https://en.numista.com/catalogue/pieces22820.html
Weight: 4.5 grams
Diameter: 23.5 mm
COIN #4
Similar coin on Numista catalogue: https://en.numista.com/catalogue/pieces26115.html
Weight: 7.4 grams
Diameter: 29 mm
COIN #5
Similar coin on Numista catalogue: ????
Weight: 3.1 grams
Diameter: 22.5 mm
Any information will help.
Thank you.
Best regards,
Lucas Lorenzi.