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I bet this two words has the same meaning, and my prediction might be one of it are obsolete and the other one are frequently used by japanese people. Not just in this case, how to self-crosscheck kanji on a word whether obsolete or not?
Thanks in advance
To check whether kanji are currently in use, you should use a Japanese native language dictionary.
I looked your words up in goo's dictionary (https://dictionary.goo.ne.jp/jn/147982/meaning/m0u/), because I was unfamiliar with both 具に and 備に.
If you look at their entry, it's written like this:
つぶさ‐に【▽具に／▽備に／×悉に】 の意味
The x means that the character 悉 is not part of Joyo orthography (Government-mandated usage).
The down-triangle means the reading of the character is not approved by Joyo orthography. (Both 具 and 備 are characters in common use, but the reading is technically not approved).
Joyo doesn't seem to absolute dictate usage on the ground, but as a non-native speaker, I assume unless I frequently see otherwise, that one should not write things with the ▽ and that Japanese people will not even recognize x kanji.
