Quarter 1977-D Weigh 5.75 Is 40% Silver Does That Apply 2 Others Quarters?

As I stated I saw 1970D saying that if it weighs 5.75 it has 40% silver in it . Does that apply to other quarters? I understand that the proofs have silver in them . But I have other quarters that weigh 5.74 to 5.78 and it's a -1990,1997 quarter,a state,& a state park quarter.. does that mean I have an error on all of them and if so do I get it sent off for authentication. I have 8 different ones and weighed them up against same type of quarter and from same Mint And the other don't weigh the same just 5.56 or 5.67. Also have over 10 that weigh 5,72-5.74 are they 40% too also when you turn them over on it's side they are mostly shinny (silver)(clad) the other side bronze 70/30 or80/20showing instead of the 50/50 or 60/40 that is on the other quarters that I have.. I am asking about the 40% silver error that are being found . Not the 90% ones John1.
as requested here are the pictures of the coins saw a coin form said if it weighs 5.75it has 40% siver in it. so sending off to get authenticated.looked around and havent seen any post about the coins I have so hopefully its a new discovery. the last pic with the coins on the rim showing from right to left,the 5.75 weight are on the right side there are 5 of them and the other 3 coins on the left are the regular 5.56 weight.