NodeMcu or Wemos D1 Mini?

[PeteKnight]

Yes.
The Wemos D1 Mini doesn’t have some of the pins that the NodeMCU has - to save space, otherwise it wouldn’t be ‘mini’.
So, if your NodeMCUcode uses GPIO 9 or 10 then you’ll find that those pins don’t exist on the Wemos. But, if you read this then you’ll see that you shouldn’t be using those pins anyway:

ESP8266 GPIO pins info, restrictions and features

hi blynkers! the esp8266 mcu is widely used in iot projects. however, most gpio pins on this mcu have special / multiple functionality and are not safe to use in all circumstances. these “features” are still not well documented and not explained in a friendly manner for newbies. i see lots of cases when the “issues” are simply caused by not knowing which pins to use in which case. [esp8266 pin features] here is a basic table for startup. i’ve collected the info from various sources on the i…

I did a bit of a comparison between various devices in this topic:

Which board should I choose for my first Blynk project?

I thought I’d write a piece about my thoughts on the best hardware to use for your IoT projects if you’re just starting-out with Blynk. I did what many people do, started-off buying an Arduino Uno and uploaded some code to make it flash an LED. After about 10 seconds of watching the LED flash I was bored, and wanted to do more (I have a short attention span ). The next task was getting the Uno connected to the internet and I chose the Ethernet Shield route. After around 6 months of m…

Pete.