enc28j60 ordere wrong resistors
It will work, but it is (will be) a mistake anyway.

Ethernet has some "tolerance budget" to deal with "non-perfect" environments. Using initially "non(-so)-perfect" design (47R instead of 49R9) you decreases the initial "tolerance budget" leaving a lesser rest (margin) to compensate the "non-perfection" ("non-ideality") of the environment.

Begin the prototyping with what you already have (47R) but don't forget to replace the mistakenly ordered resistors with the recommended (49R9) when you get the correct resistors.