"ostensibly different" is correct and usable in written English.
You can use this phrase when you are comparing two things and suggesting that, on the surface, they appear to be different, but they may not be so different when examined more closely. For example: The two candidates have ostensibly different approaches to dealing with the financial crisis, but their plans have more similarities than first appearances suggest.
"I don't differentiate," she says of navigating such ostensibly different registers.
The shared secret of these ostensibly different portraits is - accessories, incidentals, decorative "accidentals".
In May, it all happened again, for ostensibly different but ultimately related reasons.
I've layered pattern upon pattern, but beyond that I'm trying to create subliminal connections between ostensibly different sensibilities".
Both aviation giants are moaning loudly that their production systems and supply chains are flawed, albeit for ostensibly different reasons.
The study shows that the two ostensibly different precedents share obscurely many commonalities, which are greater than what their initial appearances suggest.
Ms. Kirkwood's fleet-footed script, directed by Lyndsey Turner, considers the elusive nature of heroism, the short-sightedness of the best intentions, the changing role of news photography and the parallel inequities of two ostensibly very different governments.
In his script for his 1980 play "True West," Sam Shepard goes to considerable pains to describe how his central characters, two ostensibly very different brothers, are dressed.
While each documentary focused on what were ostensibly very different topics female fighters, sex work, politics themes emerged: notably the prevalence of violence verbal and actual still perpetrated against women across all levels of society.
Romário and Ronaldo were, ostensibly, two very different players.
When that linkage recurred — in a different, ostensibly unrelated dance — it lost much of its charge.
