What i think Zigis is getting at is while they may technically fit in the same spot and might have the same design... the tubes it lists as subs vary widely in their voltage and gain, so are not drop in replacements in an amplifier.
Zigis: You only reached an intermediate page. The page titled, "I found 14 possible tube matches for [tube name]" is an intermediate step for clarification. Each of the names you listed links to the page with the actual substitution information. The "possible tube matches" seem to be somewhat hit or miss, but the page with the diagram and list of substitutes looks okay. It knows that I can replace an EL84 with a 7169, and knows that I can't replace a 7169 with an EL84. That's useful.
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