The 2 matches on 19/04/1936 were actually one match (China played 45 minutes against each team).
Not according to the "China Mail":
China Mail, Mon 20 Apr 1936:
At Caroline Hill yesterday:China B 5-4 HKFA B
Goals: Cheuk Shek-Kam, Ip Pak-Wa x2, Tio Hian-Guan, Yeung Shui-Yick / Fowler x2 (1 pen), Knox, Costa
[Fowler missed a penalty just before the end.]
China B: Wong Ki-Leung; Chung Fai-Lum, Yue Hing-Yuen; S.D.Liang[=Leung Shiu-Tong], Wong Mei-Shun, Lee Kwok-Wai; K.L.Kia[=Chia Yu-Liang], Cheuk Shek-Kam, Tio Hian-Guan, Ip Pak-Wah, Yeung Shui-Yick.
HKFA B: Boyes; Everest, Bowen; Blackburn, Costa, Elms; Fowler, G.White, Forrow, Pearce, D.Knox.
Mak Shui-Hon was ill so place taken by Chung Fai-Lum. Yue Hing-Yuen played at left back in place of Chua Boon Lay who had gone to Singapore.China A 7-1 HKFA A [70 minute match]
Goals: Lee Wai-Tong x4, Elms OG, Suen Kam-Shun x2 / Beltrao 5'
China A: Pau Ka-Ping; Lee Tin-Sang, Tam Kong-Pak; Leung Wing-Chiu, Tsui Ah-Fai, 'Darkie' Chan Chan-Wo; Tso Kwai-Shing, Suen Kam-Shun, Fung King-Cheung, Lee Wai-Tong, Tay Quee-Liang.
HKFA A: G.Rodger; Syd Strange, F.J.Elms; Farrow, N.Beltrao, Ernie Strange; F.Fowler, A.Ward, D.Leonard, G.White, B.I.Bickford.
Due to poor organisation, several HKFA players failed to show up, and so four players who had already played in the B game had to play in the A game too.
11/06/1936 - All Medan 0-2 China (RSSSF has 1-2 and 11/06 for date)
I had conflicting sources:HK Sunday Herald, Sun 14 Jun 1936
Medan, Jun 13 - China Olympic beat All-Medan 2-1 on Friday (1-0 HT).
Goals: Suen Kam-Shun, Tso Kwai-Shing / ?China Mail, Tue 21 Jul 1936
Gives summary of results, including: Jun 11 vs Medan 2-0.
Without confirmation, I originally followed the Hong Kong Sunday Herald on the grounds that it gave some detail (scorers) and came only two days after the match.
However, now we have better sources: "De Sumatra Post" confirms it was 2-0 on June 11th. In fact the score should have been 1-0 , because the report says that the first Chinese goal was a shot which passed through the outside (side netting).
04/07/1936 - Match was against "Calcutta" or "Indian champions" (I thought this might mean Calcutta league champions). West Bengal's state FA is called the "Indian Football Association"
"The Indian Express" (Madras) reports it as an Indian national team.
Although if you read the adjacent column, you can understand the selection issues.
Interesting that "Casuals" came out as "UK Wales" when I did the translation
凯休尔斯 = (phonetically) "kai hsiu er si" - this is about as close to "Casuals" as is possible in Chinese.
If you run the syllables together differently you get "kay-hsi u-er-si" -- I can see why this might be interpreted as "UK Wales". I think the moral is to ignore google for team names unless the are fairly obvious (e.g. the city is given).