How can I understand if a Kotlin project is Gradle-Kotlin or Gradle-Groovy?

actually the title is self explanatory but I'm a beginner in Java and Kotlin environments. I have to rewrite a project from scratch and I don't have much experience with these languages and their environment. How can I understand from looking a project if it's Gradle-Kotlin or Gradle-Groovy based?

The project that I will transfer is written in Maven, I know that. But I want to implement a spesific architecture with same structure of a different project, so I need to understand what is what. Than, I can initialize my project with that DSL of I need.

I looked a Kotlin project as it indicated Gradle some places but I also saw Gradle-Groovy template in it so I'm not totally sure if it is Gradle-Kotlin or Gradle-Groovy.

1. Check the Build Script File Extensions:

Gradle-Kotlin DSL:

• build.gradle.kts
• settings.gradle.kts
• init.gradle.kts
  
  Gradle-Groovy DSL:
• build.gradle
• settings.gradle
• init.gradle

2. Examine the Syntax in the Build Files:

• Gradle-Kotlin DSL:

plugins {
    kotlin("jvm") version "1.5.10"
}

dependencies {
    implementation(kotlin("stdlib"))
}

• Gradle-Groovy DSL:

plugins {
    id 'org.jetbrains.kotlin.jvm' version '1.5.10'
}

dependencies {
    implementation 'org.jetbrains.kotlin:kotlin-stdlib'
}