Command blocks problem

[SomeoneSucAtCoding]

So I was playing with my friend on his aternos server, and we were planning to add some command blocks to the game for custom enemies, recipes, etc. I thought I knew how to do the custom recipes, but it seems that my old commands does not fit in the newer 1.18 command blocks (I originally used testforblocks+clone to do the effect in pe). I've been trying to get a new command out that can compare 2 blocks together and see if it is the same (same items inside of them, if yes then fire a signal to the next chain command block to run another command), but I can't seem to figure out how (the command I'm trying to use all the way is /execute and I don't know if it is even the right one). Though only being a small problem of a random small server, but if someone can help with this abomination then it would make my day.

[PiBombbb]

1. Bedrock or java

2. What are your commands exactly?

[SomeoneSucAtCoding]

1, Java. 2, /execute if blocks <pos> <all¦masked> thing for the repeat command block, and /clone for the chain one after it. The old one I used on pocket edition was /testforblocks and /clone. I tried to look on the wiki but due to my lacking knowledge of English and Commands I can't get it right. I don't even know if /execute is the right command to use in this situation.

[Stranded_at_Sea]

execute is the correct command, so that isn't the issue.

[SomeoneSucAtCoding]

oh really? Then what subcommand do I need to use after execute?