Would anything have turned out differently had France and England declared war on Germany after invading Czechoslovakia?

Would anything have turned out differently had France and England declared war on Germany after invading Czechoslovakia?

Poland would be free

As i recall Czechoslovakia was in a better position to defend itself than Poland ever was due to the terrain and already in place fortefications.

This is true, and as an added effect, Germany wasn't nearly as strong in 1938 as they would be in 1939.

However, I'm pretty sure that Britain and France were also considerably weaker, although I haven't done a lot of reading on how much, but I know Britain for instance almost doubled her defense spending post-Munich.

How that new equation would turn out is something I don't feel qualified to make claims about.

Poland would still get fucked by the Soviets, so no.

the USSR only entered Poland after signing the MR pact and waiting two weeks or so for Germany to subdue pretty much all resistance.

None of that is likely to happen in this scenario.

>Britain and France were also considerably weaker
British and French armed forces were considerably stronger than the German armed forces until after the Czech armament factories were captured post-Munich. Neither governments wanted to go to war and fell for the German bluff/gamble because neither was mobilized for war like Germany and did not have enough popular support for a drawn out war.

Do you know if Poland would by any chance try to help czechoslovakia?
I know they annexed a bit with the Germans, thoughi think things could be different in this scenario.

no, czechoslovakia and poland were rivals back then, they even were in war for a while

France was doomed start to finish because their government couldn't last a year without new elections. New policy and catching ministers up to speed on defense couldn't possibly make up however, for head generals uniformly having bad ideas and the French economy being exhausted by the Maginot Line and four non-full tank battalions.
Don't believe the Plsen tank works meme: it doubled the mobile capabilities and added a third to the armor capabilities of the Wehrmacht: Germany had auto and tank works to spare, they were just new and the main production of PzIII and IV had just begun. The difference is a year of work and materials.
tl;dr Poland falls in same amount of time, maybe less German casualties because of less tactical experimentation and Fall of France takes twice as long due entirely to the British having their one good tank division.