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If "Reuven" believes the halacha to be one way and "Shimon" believes it to be more lenient may Reuven rely on Shimon to do something for him based on this leniency?

A practical example: Reuven's Rav has given a psak that not using a kli sheini is bishul m'deoraita. Shimon's Rav holds you can use a kli rishon. Can Reuven drink a tea made for him by Shimon?

If "Reuven" believes the halacha to be one way and "Shimon" believes it to be more lenient may Reuven rely on Shimon to do something for him based on this leniency?

Here is a 100% fictional practical example to illustrate the concept that I am asking about, please note I am NOT posing this as the actual question, the actual question is what was stated above: Reuven's Rav has given a psak that not using a kli sheini is bishul m'deoraita. Shimon's Rav holds you can use a kli rishon. Can Reuven drink a tea made for him by Shimon?