Structurally they're the same building blocks, the difference in definitions is by outcome not structure. It's just what other structures they are keyed to interact with by the specifics of their sequence.

When it comes to hastily man-made analogues with dubious stability and an indeterminable number of unintended byproduct and partially broken sequences mixed in, having some unintended interactions similar to non-coding RNA is eminently possible.

Structurally they're the same building blocks, the difference is just what other structures they are keyed to interact with by the specifics of the sequence.

When it comes to hastily man-made analogues with dubious stability and an indeterminable number of unintended byproduct and partially broken sequences mixed in, having some unintended interactions similar to non-coding RNA is eminently possible.