Catholic Bishops are concerned about the Johnston and Johnston vaccine because it was made with aborted fetal cells. So there is an ethic concern with Catholics on the Johnston and Johnston vaccine. Not the other vaccines though.
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made with cells derived from cells extracted from an aborted fetus and then passaged (grow to several 100 cell divisions on a plate, suspend in solution, discard 99% of cells, repeat hundreds of times, eventually magic happens). To call the vaccine "made from aborted fetal cells" is their argument, but it elides an astounding amount of distance between the cells used for virus production and actual aborted fetal cells.
Anything to do with aborted human fetal cells is considered a sin in the Catholic faith.
The killing of an unborn child via abortion is definitively considered a sin, but receiving a vaccine developed from those cells is an act sufficiently detached from that sin that most bishops are okay with it, so the rulings are going at the moment.