Pin Arrangement which one should i follow?
If we look at the two pinouts side by side, it becomes easier to compare the pins.  In the following image the Renesas chip (HD74LS48P) is on the left, and the TI chip (the SN74LS48N) is on the right.



Going down from pin 1 to pin 8 we have for the two chips


HD74LS48P: Input B / SN74LS48N: B
HD74LS48P: Input C / SN74LS48N: C
HD74LS48P: Lamp Test / SN74LS48N: LR
HD74LS48P: BI/RBO / SN74LS48N: RBO
HD74LS48P: RBI / SN74LS48N: RBI
HD74LS48P: Input D / SN74LS48N D
HD74LS48P: Input A / SN74LS48N A
HD74LS48P: GND / SN74LS48N GND


Similar correspondence obtains on the right. Therefore we conclude that the pinouts are identical.

Note that the HD74LS48P chip is not recommended for new designs.