Reports / SQL question to compare 3 items 2 types

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I have got 3 different flows but on each flow I have got the same data in one variable (key).
in flow 1 is Signature
in flow 2 is WFD_AttChoose5 {72}
in flow 3 is WFD_AttChoose6 {692}

how to do SQL request or more interesting is how to do report where I can:

filter Signature = WFD_AttChoose5 {72} = WFD_AttChoose6 {692}

In Webcon reports I don't see process fields if I add 2 or more processes to report :/
so I can't do filter on request :/

so maybe in Source create Source by SQL requests ... and then put it to Reports ... but again I don't see option to do that :/

Any suggestions?