A. Aruch Hashulchan (O.H. 128:72) deals with the question if the obligation of V’kidashto is incumbent only on non-Kohanim, or are Kohanim also included in honouring other Kohanim? Poskim write that the mitzvos of honouring a Kohen, such as offering the Kohen the best portion or offering him to lead the bentching (blessing after the meal), would certainly not apply to a Kohen. Since he can accept the honour himself, he is not ordained to offer it to another Kohen.
However, the question is relevant as to whether a Kohen is permitted to benefit from the service of another Kohen. If the mitzvah does not apply to Kohanim, then they may use other Kohanim for their own benefit.
If Kohanim are also obligated in V’kidashto then the same prohibition that a Yisroel has to not use a Kohen for his own personal benefit would apply to Kohanim as well.
The Aruch Hashulchan leaves this question unresolved. However, the Mishnah Berurah (Beiur Halacha 128, s.v. Assur) writes that a Kohen may be lenient, provided he does not ask a Kohen to perform menial tasks which would be demeaning to the honour of the Kehuna.
Rabbi A. Bartfeld as revised by Horav Y. Hirshman, Horav Dovid Pam, Horav Aharon Miller and Horav Chanoch Ehrentreu, Horav Kalman Ochs, and Horav Dovid Bartfeld consulting in need Horav Hagaon Rav Yitzchak Berkowitz Shlit’a