Resusing my own poster abstract for another conference

I have to write an (poster-) abstract for a conference in April. Back in November I already wrote an abstract for a similar conference. Since I have not gained many new results on the same research topic, I made some minor changes to the 'old' abstract and was thinking about submitting this 'reused' abstract for the conference in April.

Is that professional? Or is this even plagiarism, since I copied work that is already published (I am first-author of the 'old' and 'reused' abstract)?

I am not lazy, but the abstract that I wrote last year seems to be very good and I don't see the point in rephrasing it.