"I am one with The Force, and The Force is with me."
"The Force is with me, and I am one with The Force."
I'm sure there must be meaning in it. Why the reversal?
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The novelization indicates that the reversed version is intended as the "response" in a "call-and-response" phrasing (emphasis mine):
Baze Malbus cradled the last true Guardian of the Whills in his arms and answered Chirrut's dying words. "The Force is with me," Baze said. "And I am one with the Force."
Rogue One: A Star Wars Story - Official Novelization Chapter 20
Call-and-response isn't a terribly uncommon phrase construction for prayers.
Presumably, Baze's line is the other half of Chirut's prayer, which he's just been neglecting to provide throughout the earlier parts of the film. It's also worth noting that the Guardians of the Whills aren't unfamiliar with the use of antimetabole and chiasmus, as seen in another of their prayers in the novelization:
Supplemental Data: Sunset Prayer
[Document #JP0103 ("Sunset Prayer of the Guardians of the Whills"), recovered from the outskirts of NiJedha; provenance uncertain.]
In darkness, cold.
In light, cold.
The old sun brings no heat.
But there is heat in breath and life.
In life, there is the Force.
In the Force, there is life.
And the Force is eternal.
Rogue One: A Star Wars Story - Official Novelization Supplemental Data: Sunset Prayer