It doesn't matter because the vast, vast, vast majority of people lack any sort of technical nuance to negotiate such mild differences in a rush.
As pedantic as the viewer's interpretation may be, the author in any sort of emoji context, is moving fast, to snipe the conversation, just to get a word in, edgewise.
And with soft keyboards, touch typing is non-existent, and adjacent, similar smiley faces get used way, way, way more loosely than abbreviated initialisms (omg r u srs 2???) or typos (your and awesome person) so, to mince emojis as highly specific in meaning is silly.
Half of all emoji usage is drunk dials. The other half is precision cyber bullying and organized crime. Only the margin of error is left to be considered as conveyed in earnest by the sober minded, prudent and cautious fellow citizens we share the road with.
My grandma can't tell the difference. My mom can't tell the difference. My dad doesn't care. My kindergartener just likes them all. 90% of the world isn't equipped to parse mojis in strict mode, but that doesn't mean their emoji use won't be strictly consumed and observed after the fact.
