**SNAKE * 2 = MERES
COYPU * 8 = POODLE
TIGER * 13 = BEWAIL
OKAPI * 14 = HIJACK**

Repeated letters *within* an equation refer to the same digit. The *same* letter appearing in *different* equations does not necessarily refer to the *same* digit.

The puzzle can be solved from just two equations. The other two are for fun/reference.

This is similar to Can't see the wood for the trees