It should be considered unethical for a pastor to intentionally seek to persuade a member of another congregation, especially of his own denomination, to change their membership without some good reason, such as a difference in theological belief or worship practice. Such should be reported to the new pastor, and possibly to the presbytery.

At present, I don't have time to search the PCUSA Book of Church Order; if indeed, this is the denomination to whcih this congregation belongs (there being a number of Presbyterian and Reformed denominations in North America).  I myself am a minister of the Orthodox Presbyterian denomination.

But, such action could be seen as attempting to undermine another church in the same denomination and presbytery.  I wouldn't even do this to a non-Presbyterian church.  Persons should only be encouraged to consider another congregation because they've moved, circumstances have changed making it more difficult to get to their current church, their beliefs regarding doctrine or practice have changed from those of the congregation to which they belong, or their current church is teaching heretical doctrine.  In the last case, if the two congregations are part of the same denomination, a complaint should be brought to the presbytery rather than trying to steal their sheep behind their back.

On the other hand, I'd encouage all congregations and members of the PCUSA to consider whether their church still exhibits the essential marks of a true church if Jesus Christ.  If not, come out of her.