If the following keytool import into a fresh JKS keystore is run twice the binary keystore from each run is different:

keytool -noprompt -import -storetype JKS -alias "myalias" -file mycert.crt -keystore cacerts1 -storepass changeit
keytool -noprompt -import -storetype JKS -alias "myalias" -file mycert.crt -keystore cacerts2 -storepass changeit
diff cacerts1 cacerts2
Binary files cacerts1 and cacerts2 differ