Is cordova.js different on iOS and Android?

ionic build different platform:
browser:

Initial Chunk Files                       | Names             |      Size
main.811e669d86d2f5df3a7a.js              | main              | 392.79 kB
polyfills.7491caa4388fdb04d1c6.js         | polyfills         |  33.18 kB
styles.b027edf709b28ef7e849.css           | styles            |  25.53 kB
cordova.63b449c962532a113eb6.js           | cordova           |  15.76 kB
runtime.c13821c2bd2901bddba7.js           | runtime           |   4.75 kB

                                          | Initial Total     | 472.01 kB

iOS:

Initial Chunk Files                       | Names             |      Size
main.811e669d86d2f5df3a7a.js              | main              | 392.79 kB
polyfills.7491caa4388fdb04d1c6.js         | polyfills         |  33.18 kB
styles.b027edf709b28ef7e849.css           | styles            |  25.53 kB
cordova.e708e5acff70658f793c.js           | cordova           |  19.82 kB
runtime.c13821c2bd2901bddba7.js           | runtime           |   4.75 kB

                                          | Initial Total     | 476.07 kB

android:

Initial Chunk Files                       | Names             |      Size
main.811e669d86d2f5df3a7a.js              | main              | 392.79 kB
polyfills.7491caa4388fdb04d1c6.js         | polyfills         |  33.18 kB
styles.b027edf709b28ef7e849.css           | styles            |  25.53 kB
cordova.413eeafd58d76d27d4ba.js           | cordova           |  20.95 kB
runtime.c13821c2bd2901bddba7.js           | runtime           |   4.75 kB

                                          | Initial Total     | 477.21 kB

Only cordova file size is different.
I often use ionic cordova build android and then go straight to use cordova prepare ios, omit Initial Chunk Files once

Yes, each Cordova platform is different and includes its own cordova.js