The short answer to the killing question would be no, but likely trying to mate.
What are your water parameters?
How old is your tank?
Have your changed the filter pads in the past several weeks around the time you started getting the other new snail, or changed the substrate around that time?
Read the article link in my signature, at the bottom of this post - "Getting started". This will help explain the nitrification cycle and not throwing away your filter pads, and the knowledge to create a beneficial bacteria colony able to keep your tank inhabitants safe.
Also have you used any medication in the tank? Some medications contain ingredients dangerous to invertebrates, i.e. copper and similar metals, and ingredients.
Sometimes adding additional inhabitants creates a mini cycle due to the changes of more foods and waste being produced than the amount of BB / beneficial bacteria can process.