It's not a problem to connect two linear regulators in parallel (of the same voltage!) Theoretically one will be just slightly higher than the other (due to manufacturing variations) and will supply all the current while the other will supply no current. In practice, due to resistance of PCB traces and such, there will be some current split between them.
But it is not a problem.
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The Rugged Motor Driver: two H-bridges, more power than an L298, fully protected