pd.concat Problem

[WiPi]

sorry I maybe should have put more explanation content so the 2 files have data exactly like this:

Output:
2020.05.15 15:00	EURJPY	Sell	0.14	115.548
2020.05.15 16:00	EURJPY	Sell	0.22	115.772
2020.05.18 16:00	EURJPY	Sell	0.34	116.45
2020.05.18 21:00	EURJPY	Sell	0.53	117.184
2020.05.19 14:00	EURJPY	Sell	0.8	118.039
2020.05.22 16:00	USDCAD	Buy	0.15	1.40362
2020.05.22 20:00	USDCAD	Buy	0.23	1.40155
2020.05.25 10:00	EURUSD	Sell	0.15	1.08785
2020.05.25 11:00	USDCHF	Buy	0.15	0.97336
2020.05.25 12:00	EURUSD	Sell	0.23	1.08885
2020.05.25 12:00	USDCHF	Buy	0.23	0.97253
2020.05.25 20:00	USDCAD	Buy	0.15	1.39864

I want to append one of them to the end of the other - NOT side by side i.e not creating 8 columns.