# will vs would (in the meaning "am/are/is willing to")

cambridge.org: "Will" and "would" can be used in conditional clauses, either with the meaning of ‘being willing to do something’, or to refer to later results:
(1) If Clare will meet us at the airport, it will save us a lot of time.
(2) If you would all stop shouting, I will try and explain the situation!

Cambridge says (1) = (1a):
(1a) If Clare is willing to meet us at the airport, it will save us a lot of time.
I was told here that (2) = (2a):
(2a) If you are all willing to stop shouting, I will try and explain the situation!

From these examples I infer that in the meaning of ‘being willing to do something’:
will = would = am/are/is willing to

Therefore, I can replace "will" and "would" with each other without changing the meaning:
(3) If Clare would meet us at the airport, it will save us a lot of time.
(4) If you will all stop shouting, I will try and explain the situation!

That is:
(1) = (3)
(2) = (4)

If I'm not right, tell me please:
Why does my logic not work?
What is the difference between (1) and (3)?
What is the difference between (2) and (4)?

• The difference between #1 and #3 is that #3 explicitly refers to whether or not Clare is willing to go to the airport. In #1 it's at least possible Clare has given no thought to whether her future includes being there or not - and may never do so (it could be "intention-agnostic", same as If Clare meets us at the airport...). Note that although "unlikely", If the London train will arrive at the airport before [blah blah] is syntactically valid (speaker doesn't currently know what time that train is due to arrive, even if the train company think they know for sure! :). Commented Jul 16, 2023 at 17:35
• ...and the difference between #2 and #4 is that #4 is relatively unlikely. And #4 doesn't necessarily mean exactly the same thing; the addressees may all in principle be "willing" to be quiet, but in practice they may be so excited they're completely unable to restrain themselves. Commented Jul 16, 2023 at 17:40