For "All is One", I would follow the example of St. Anselm of Canterbury
(De processione Spiritus
) and say Omnia sunt Unum
For "All is All", I would say "Omnia sunt Omnia
However, on re-reading your request, I see that you are personifying
"one" and "all" (the predicate nominatives). In this case I would still
in the first sentence, but Totum
in the second as that
suggests all things considered as a whole.
Omnia est Unum
Omnia est Totum
Please read this.