I'll bet a lot of money that it was.
1.The position of Mothra and Kong are nearly identical.
2.Both scenes involve a lot of mist.
3.The coloring is pretty similar.
4.The purpose of the scenes are to establish that both Mothra and Kong are friendly to humans.
5.Last but not least, the scenes involve the same amount of humans.
There are just way too many similarities for this to be purely coincidental.