moto-bootlogo is only for motorolas partitioning scheme.
(some?) Samsungs have a param.bin partition image that includes most of the splash/warning screens, it’s a tarball (.tar) exported by heimdall. xda forum should have you covered.
$ file param.bin
param.bin: POSIX tar archive (GNU)
$ tar tvf param.bin
...
-rwxrwxrwx 0/0 36654 2019-08-04 20:28 booting_warning.jpg
-r--r--r-- dpi/dpi 249312 2019-07-02 22:34 device_lock.jpg
-r--r--r-- dpi/dpi 195112 2019-07-02 22:34 device_unlock.jpg
...
-r--r--r-- dpi/dpi 99413 2019-07-02 22:34 logo.jpg
-r--r--r-- dpi/dpi 57075 2019-07-02 22:34 lpm.jpg
...
-rwxrwxrwx 0/0 71619 2019-08-04 22:39 svb_orange.jpg
-r--r--r-- dpi/dpi 31911 2019-07-02 22:34 unlock_L.jpg
-r--r--r-- dpi/dpi 317014 2019-07-02 22:34 warning_L.jpg
-r--r--r-- dpi/dpi 355198 2019-07-02 22:34 warning_SVB.jpg