this _may_ work: Include a dummy dataset with DISP=OLD in the JCL for both started tasks. Start them one after the other in the order you want them to run or if you have an automated operations tool, start them a second apart or more - whatever you are comfortable with. The DISP=OLD will cause an enqueue and prevent the second one from starting until the other one finishes. Depending upon your shop's parameters the operators may or may not see a message about the second started task waiting for dataset.
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