California Code, Financial Code - FIN § 4879.14

(e)(1) In case the partial business unit sold includes trust business, the purchaser shall succeed, without further transfer, to the rights, obligations, properties, assets, investments, deposits, demands, agreements, and trusts of the seller under all trusts, executorships, administrations, guardianships, agencies, and all other fiduciary or representative capacities sold to the purchaser under the agreement of sale, to the same extent as if the purchaser had originally assumed the fiduciary or representative capacities.

(2) In case the partial business unit sold constitutes all or substantially all the trust business of the seller, the purchaser shall, in addition, be entitled to take and execute the appointment to all executorships, trusteeships, guardianships, and other fiduciary or representative capacities to which the seller is or may be named in wills, whenever probated, or to which the seller is or may be named or appointed by any other instrument.