Both are very short GL films.
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Both are short and very sweet GL films.
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Both are short and very sweet GL films.
.............................................................................................................

Both are short and very sweet GL films.
.............................................................................................................

Both are short and very sweet GL films.
.............................................................................................................

Both are short and very sweet GL films.
.............................................................................................................

Both are short and very sweet GL films.
.............................................................................................................

Both are short and very sweet GL films.
.............................................................................................................

Both are short and very sweet GL films.
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Both are about identical twin sisters, one of whom meets the ML first and ends up taking her twin's place in an agreement to marry him.

The FLs have a similar personality, both MLs are aquatic creatures, and both the settings/tone have a similar feel.

Both are short films with a historical setting about a love story between two girls. Both have the same actress as the FL.